Applet not loading

Hi,
When i try to run the work flow - process designer using sun VM, it is not loading.
but when i try to run the same using microsoft VM, it is working properly. is there any fix for this issue?
It is giving the error "The siebel applet is required in order to run the application. please close the browser and login using the new browser window."
i also given the java_log_siebel_applet.log
Java Plug-in 1.5.0_09
Using JRE version 1.5.0_09 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\pk95461
network: Loading user-defined proxy configuration ...
network: Done.
network: Loading proxy configuration from Internet Explorer ...
network: